Welding auxiliary device and auxiliary method thereof

Abstract

The invention discloses a welding auxiliary device and an auxiliary method thereof, belongs to the technical field of lithium ion batteries, and aims to solve the problems of tab protection and dust cleaning during existing battery welding. The device comprises a dust removal base and a roll core jig, and the dust removal base comprises a first substrate and a second substrate arranged on the first substrate; the roll core jig comprises a groove matched with the dust removal base and roll core containing grooves located in the two sides of the groove. A plurality of corresponding holes and grooves are formed in the first base plate and the second base plate, and after the first base plate and the second base plate are fixed, the corresponding holes and grooves form a welding avoiding part, a dust blowing part, a main dust suction part and an auxiliary dust suction part; the groove is used for accommodating the dust removal base, the positive pole lug, the negative pole lug, the positive pole connecting piece and the negative pole connecting piece. According to the invention, the tab can be prevented from being wrinkled, folded and damaged in the welding process, and meanwhile, the problem of low later yield caused by the fact that welding dust enters the roll core in the dust removal process is avoided.

Description

Technical Field

[0001] This invention relates to a welding auxiliary device and method, belonging to the field of lithium-ion battery technology. Background Technology

[0002] In the traditional ultrasonic welding process of square batteries, the tabs of the incoming core often fold during the transfer process. This prevents the loosely packed tabs from being fused together during ultrasonic welding, resulting in incomplete or missed welds and severely impacting product quality. Traditional dust removal devices are often integrated into the ultrasonic welding head, using negative pressure to extract the metal dust generated by the welding head. However, the negative pressure dust removal port located above the tabs exacerbates the folding and warping of the core tabs. Simultaneously, the tabs are subjected to the compressive force of the welding head, making them prone to tearing.

[0003] In the ultrasonic welding process of traditional square batteries, the unwelded areas lack protection, allowing metal dust generated during welding to easily diffuse into the core. Foreign metal objects inside the core are a major cause of internal short circuits. Larger metal particles can directly pierce the separator, leading to a short circuit between the positive and negative electrodes. Furthermore, when foreign metal objects mix into the positive electrode, they undergo oxidation at the high potential, dissolving into metal ions. These ions diffuse through the electrolyte to the negative electrode, where they are reduced to elemental metal at the low potential, forming dendrites. Lithium metal preferentially deposits using these foreign metal objects as nuclei, forming lithium dendrites, further increasing the risk of separator puncture and ultimately causing an internal short circuit.

[0004] In addition, during long-term welding operations, metal dust accumulates on the surface of the welding head and the inner wall of the negative pressure dust removal port. Traditional solutions require periodic shutdowns for cleaning, which limits the efficient operation of the welding process. Although existing technologies also employ dust-collecting welding guns, such as CN216462426U which discloses a welding base with a dust-collecting function and a semi-enclosed space, in actual use, this device can only capture dust before it spreads, and the dust removal effect is not good. Therefore, the existing welding process lacks an integrated auxiliary device for effective welding protection and dust removal. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a welding auxiliary device and its auxiliary method, which aims to solve the problems of dust cleaning and electrode tab damage during welding. By cooperating with the dust removal base and the core jig, the core and electrode tab can be set in separate areas to avoid electrode tab wrinkling, folding and breakage during the welding process. At the same time, it avoids the problem of low yield rate in the later stage caused by welding dust entering the core during the dust removal process.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution: In a first aspect, the present invention provides a welding auxiliary device, comprising: The dust removal base includes a first substrate and a second substrate disposed on the first substrate; The core fixture includes a groove adapted to the dust collection base and core receiving slots located on both sides of the groove; The first substrate and the second substrate are provided with a number of corresponding holes and slots. After the first substrate and the second substrate are fixed, the corresponding holes and slots form a welding avoidance part, a dust blowing part, a main dust extraction part and a secondary dust extraction part. The dust blowing section, main dust extraction section and auxiliary dust extraction section are respectively connected to relevant positive pressure equipment and negative pressure equipment; The groove is used to accommodate the dust removal base, positive electrode tab, negative electrode tab, positive electrode connecting piece, and negative electrode connecting piece.

[0007] In this solution, after the core jig and dust collection base are assembled, the core and the tabs can be separated and limited. The dust collection base physically positions the positive and negative tabs, positive and negative connecting pieces and the core respectively, which can avoid the tabs bending or the core metal fatigue causing the tabs to curl. At the same time, the welding avoidance part, dust blowing part, main dust extraction part and auxiliary dust extraction part perform fixed-point welding, positive pressure dust removal and negative pressure collection processes, effectively forming a fully enclosed welding and dust removal channel during the welding process, avoiding the overflow and pollution of metal dust.

[0008] Optionally, the welding clearance portion includes a first clearance hole formed on the first substrate and a second clearance hole formed on the second substrate; The first clearance hole and the second clearance hole are axially opposite each other after the first substrate and the second substrate are fixed, and the inner surface of the second clearance hole is a beveled surface.

[0009] In this design, the first and second clearance holes allow the welding head to be inserted into the counter electrode for spot welding, reducing welding errors. The inner surface of the second clearance hole is an angled surface, which reduces the probability of the welding head colliding with the hole wall, thereby reducing the maintenance cost of the welding head. At the same time, compared with the right-angle hole wall, which is prone to forming a slag retention area, the angled surface guides and removes the dust and impurities generated during welding.

[0010] Optionally, the dust blowing part includes a first dust blowing groove formed on the first substrate, a dust blowing hole communicating with the first dust blowing groove, and a second dust blowing groove formed on the second substrate and communicating with the welding avoidance part, the main dust extraction part and the auxiliary dust extraction part respectively. The first dust blowing groove is located on the lower side of the first substrate and communicates with the outside through a dust blowing hole; The second dust-blowing groove is located on the upper side of the second substrate and is adapted to the first dust-blowing groove and dust-blowing hole.

[0011] In this design, the first dust blowing groove is located on one side of the first clearance hole, and the second dust blowing groove is located on one side of the second clearance hole. This forms a structure in which the dust blowing part and the welding clearance part are connected after the first substrate and the second substrate are fixed. The dust blowing hole is then connected to an external positive pressure device, and positive pressure airflow is used to deliver air to the welding clearance part to prevent dust from accumulating in the welding area. This achieves efficient dust removal and precise protection of the welding area.

[0012] Optionally, the main dust extraction unit includes a first main dust extraction groove connected to the first substrate, a main dust extraction hole communicating with the first main dust extraction groove, and a second main dust extraction groove installed on the second substrate and communicating with the welding avoidance part, the dust blowing part and the auxiliary dust extraction part respectively. The first main dust extraction tank is located on the lower side of the first substrate and communicates with the outside through the main dust extraction hole; The second main dust extraction groove is located on the upper side of the second substrate and is adapted to the first main dust extraction groove and the main dust extraction hole.

[0013] In this design, the first main dust extraction trough is located on the other side of the first clearance hole, and the second main dust extraction trough is located on the other side of the second clearance hole. Thus, after the first substrate and the second substrate are fixed, a structure is formed in which the main dust extraction part is connected to the welding clearance part and the dust blowing part. Then, the negative pressure equipment or negative pressure pipe connected to the main dust extraction hole can use the negative pressure airflow to collect the dust blown by the dust blowing part, forming a positive and negative pressure closed-loop dust removal system to prevent dust from spreading outward.

[0014] Optionally, the auxiliary dust extraction unit includes a first auxiliary dust extraction groove connected to the first substrate, an auxiliary dust extraction hole communicating with the first auxiliary dust extraction groove, and a second auxiliary dust extraction groove installed on the second substrate and communicating with the welding avoidance part, the dust blowing part, and the main dust extraction unit respectively. The first auxiliary dust extraction tank is located on the lower side of the first substrate and communicates with the outside through the auxiliary dust extraction hole; The second auxiliary dust extraction groove is located on the upper side of the second substrate and is adapted to the first auxiliary dust extraction groove and auxiliary dust extraction hole.

[0015] In this design, the first auxiliary dust extraction trough is located in the middle of the first clearance hole, and the second auxiliary dust extraction trough is located in the middle of the second clearance hole. This forms a structure in which the auxiliary dust extraction part is connected to the main dust extraction part, the welding clearance part, and the dust blowing part after the first and second substrates are fixed. Then, a negative pressure device or negative pressure pipe is connected to the auxiliary dust extraction hole, which can work in coordination with the main dust extraction part. The negative pressure is increased on the basis of the main dust extraction part, so that the dust is discharged from the welding area at high speed. At the same time, the number of adsorption channels is increased and the auxiliary dust extraction hole sucks up the escaped dust.

[0016] Optionally, the two ends of the second substrate that contact the sides of the groove are provided with rounded corners.

[0017] In this design, both the tabs and connecting pieces extend from the core into the groove. The rounded corner design prevents the edges of the second substrate from bending and squeezing the positive and negative tabs and connecting pieces, further protecting the overall shape of the tabs.

[0018] Optionally, corresponding connection holes are provided on both the first substrate and the second substrate, and the connection hole on the first substrate is a countersunk hole. The first substrate is also connected to an external driving device for driving the dust removal base toward the core jig after the first substrate and the second substrate are assembled.

[0019] In this solution, after the first and second substrates are assembled, the bolt head is fully accommodated by the countersunk hole to prevent the bolt from protruding from the surface of the first substrate. At the same time, the dust removal base is driven to reciprocate toward the core jig by a robotic arm or external drive device, which replaces manual labor and reduces labor costs.

[0020] Optionally, the first substrate includes a central plate adapted to the groove and the second substrate, and two pressure plates symmetrically mounted on both sides of the central plate and adapted to the core receiving groove. The two pressure plates are used to press down on the core placed in the core receiving slot.

[0021] In this solution, two pressure plates are used to press and fix the core. With the middle plate as the center of symmetry, the two pressure plates apply equal pressure to the core on both sides, which can avoid core displacement or inconsistent tension. This achieves high-precision positioning, dynamic stability control and tab protection during core assembly and welding. At the same time, after the two pressure plates limit the core, they can suppress the friction between the core and the core receiving groove, effectively blocking the transmission of external vibration.

[0022] Optionally, the dust blowing unit is connected to a positive pressure device via a compressed air pipeline, and the main dust extraction unit and the auxiliary dust extraction unit are connected to negative pressure devices via corresponding negative pressure dust extraction pipelines.

[0023] In this solution, an air compressor is connected to an external compressed air pipeline through a dust blowing hole. The main dust extraction hole and the auxiliary dust extraction hole are respectively connected to corresponding negative pressure dust extraction pipelines to a dust collector or a central dust collection system. By combining positive pressure purging with multi-stage negative pressure suction, efficient dust removal, particulate pollution control, and improved process environment stability are achieved before and after core welding.

[0024] In a second aspect, the present invention provides a welding assistance method, based on the apparatus described in the first aspect, comprising: Place the core in the core receiving groove of the core fixture, and lay the positive electrode tab, negative electrode tab, positive electrode connecting piece and negative electrode connecting piece on the core flat in the groove, wherein the positive electrode connecting piece and negative electrode connecting piece are located below the positive electrode tab and the negative electrode tab respectively. After the first substrate and the second substrate are assembled and fixed together, a dust removal base is formed. The dust removal base is then fastened into the groove, and the welding clearance portion is aligned with the top of one of the tabs. The ultrasonic welding head extends into the welding clearance section to weld the lower electrode tab. During the welding process, the positive pressure device and the negative pressure device are turned on to deliver high-pressure air to the dust blowing section and negative pressure airflow to the main dust extraction section and the auxiliary dust extraction section, respectively. The metal dust generated during welding is cleaned by positive pressure through the dust blowing section and collected by negative pressure through the main dust extraction section and the auxiliary dust extraction section. After the current electrode tab is welded, remove the dust removal base and ultrasonic welding head, turn the position of the dust removal base and re-fasten it in the groove, or turn the position of the core jig and re-fasten it with the auxiliary device, so that the welding avoidance part is aligned with the next electrode tab, and repeat the above steps to complete the welding of all positive and negative electrode tabs in sequence.

[0025] This solution requires four ultrasonic welding operations to complete the welding of the core. The dust removal base can shape the tabs of the incoming core to prevent the tabs from being missed during welding due to folding. At the same time, it can accurately position and isolate the tabs for welding, realizing an integrated design of tab shaping and welding dust removal.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: In the welding process, the present invention uses a dust removal base and a core jig to set and position the core and the tab in different areas. The dust removal base can improve the welding accuracy through the welding avoidance part, and at the same time, the dust blowing part, the main dust extraction part and the auxiliary dust extraction part can efficiently remove the metal residue generated by welding, prevent the metal residue from spreading into the core and improve the battery qualification rate.

[0027] The core-winding fixture of the present invention utilizes grooves to accommodate the positive electrode tab, negative electrode tab, positive electrode connecting piece and negative electrode connecting piece, so that they are fully laid flat under the dust removal base, which can avoid the electrode tab from having poor soldering or missing soldering, and also prevent the electrode tab from being deformed and damaged by airflow interference. Attached Figure Description

[0028] Figure 1 This is an embodiment diagram of the cooperation between the core jig, dust removal base and incoming core of the present invention; Figure 2 These are schematic diagrams a and b of the front and rear structures of the dust removal base of the present invention; Figure 3 These are a top view (a) and a three-dimensional view (b) of the second substrate of the present invention; Figure 4 yes Figure 3 A sectional view at point AA in 3D view b; Figure 5 yes Figure 3 The sectional view at point BB in top view a; Figure 6 These are schematic diagrams a and b of the front and back structures of the first substrate of the present invention; Figure 7 yes Figure 6 A cross-sectional view at point CC in frontal structural schematic a; Figure 8 yes Figure 6 A cross-sectional view at point DD in schematic diagram b of the rear structure; Figure 9 yes Figure 2 A cross-sectional view at SS in the front structural schematic diagram a; Figure 10 yes Figure 2 A cross-sectional view at point KK in the front structural schematic diagram a; Figure 11 This is a schematic diagram of the incoming state of the core on the core jig of the present invention; Figure 12 yes Figure 1 Cross-sectional view at EE in the embodiment diagram.

[0029] In the diagram: 10-Dust removal base, 101-Second substrate, 102-First substrate, 1011-Upper side of the second substrate, 1012-Second clearance hole, 1013-Second blowing channel, 1014-Second main dust extraction channel, 1015-Second auxiliary dust extraction channel, 1016-Connecting hole, 1017-Rounded corner, 1018-Beveled surface, 1021-Lower side of the first substrate, 1022-First clearance hole, 1023 - First dust blowing groove, 1024- First main dust extraction groove, 1025- First auxiliary dust extraction groove, 1026- Countersunk hole, 1027- Pressure plate, 10231- Dust blowing hole, 10241- Main dust extraction hole, 10251- Auxiliary dust extraction hole, 20- Core jig, 201- Groove, 202- Core receiving groove, 30- Core, 40- Positive electrode tab, 50- Negative electrode tab, 60- Positive electrode connecting piece, 70- Negative electrode connecting piece. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example

[0031] This embodiment provides a welding auxiliary device, such as... Figure 1 The diagram shows: a dust removal base 10 and a core jig 20; wherein, as shown... Figure 2 As shown, the dust removal base 10 includes a first substrate 102 and a second substrate 101, as follows: Figure 2As shown in Figures a and b, the second substrate 101 is disposed on the first substrate 102, and the first substrate 102 and the second substrate 101 are provided with a plurality of corresponding holes and slots. After the first substrate 102 and the second substrate 101 are fixed, the corresponding plurality of holes and slots form a welding avoidance part, a dust blowing part, a main dust extraction part, and a secondary dust extraction part. Figure 1 The shown core jig 20 is adapted to the dust collector base 10 and includes: a groove 201 and a core receiving groove 202; the groove 201 is used to adapt to the dust collector base 10, such as... Figure 11 The groove 201 shown is used to accommodate the dust removal base 10, the positive electrode ear 40, the negative electrode ear 50, the positive electrode connecting piece 60, and the negative electrode connecting piece 70; the core receiving groove 202 is located on both sides of the groove 201, and the edge of the core receiving groove 202 is provided with multiple baffles to limit the core 30.

[0032] In use, the dust collection base 10 is connected to relevant positive and negative pressure devices (not shown) via a dust blowing section, a main dust extraction section, and a secondary dust extraction section, forming a fully enclosed positive and negative pressure dust collection channel during the welding process. In this solution, after the core jig 20 is assembled with the dust collection base 10, it can isolate and limit the core 30 and the electrode tabs. The dust collection base 10 physically positions the positive and negative electrode tabs 50, the positive and negative electrode connecting pieces 70, and the core 30, respectively, which can prevent the electrode tabs from bending or warping caused by metal fatigue of the core 30. At the same time, the welding avoidance section is used for fixed-point welding. The dust blowing section, the main dust extraction section, and the secondary dust extraction section are connected to external devices, and a positive and negative pressure combined dust collection process is carried out during the welding process, effectively forming a fully enclosed dust collection channel during the welding process and preventing metal dust from overflowing and causing pollution.

[0033] Optional, such as Figures 3 to 6 The welding clearance portion shown includes: a first clearance hole 1022 and a second clearance hole 1012; as shown Figure 6 The first clearance hole 1022 is formed on the first substrate 102; the first clearance hole 1022 and the second clearance hole 1012 are axially opposite each other after the first substrate 102 and the second substrate 101 are fixed. Figure 3 The second clearance hole 1012 is formed on the second substrate 101, and as shown... Figure 4 and Figure 5 The inner surface of the second clearance hole 1012 shown is a beveled surface 1018.

[0034] In this embodiment, the first clearance hole 1022 and the second clearance hole 1012 correspond to allow the welding head to extend into the counter electrode for spot welding, reducing welding errors. The inner surface of the second clearance hole 1012 is a beveled surface 1018, which can reduce the probability of the welding head colliding with the hole wall, thereby reducing the maintenance cost of the welding head. At the same time, compared with the right-angle hole wall, which is prone to forming a residue retention area, the beveled surface 1018 can guide the airflow during dust removal and blowing, making it easier to remove the dust and impurities generated during welding.

[0035] Optional, such as Figures 3 to 7 The dust blowing unit shown includes: a first dust blowing groove 1023, a dust blowing hole 10231, and a second dust blowing groove 1013; as shown Figure 6 As shown in Figures a and b, the first dust-blowing groove 1023 is formed on the lower side surface 1012 of the first substrate, and the dust-blowing hole 10231 is connected to the first dust-blowing groove 1023, as shown in Figures a and b. Figure 3 Chinese figures a, b, Figure 4 and Figure 5 The second dust-blowing groove 1013 shown is formed on the upper side 1011 of the second substrate and is connected to the second welding clearance hole, the second main dust extraction groove 1014, and the second auxiliary dust extraction groove 1015 respectively. The first dust-blowing groove 1023 is located on the lower side 1012 of the first substrate and communicates with the outside through the dust-blowing hole 10231; Figure 9 The second dust-blowing groove 1013 shown is adapted to the first dust-blowing groove 1023 and the dust-blowing hole 10231.

[0036] In this embodiment, the first dust-blowing groove 1023 is located on one side of the first clearance hole 1022, and the second dust-blowing groove 1013 is located on one side of the second clearance hole 1012, so that after the first substrate 102 and the second substrate 101 are fixed (as shown in the figure), the dust-blowing groove 1023 is located on one side of the second clearance hole 1012, and the dust-blowing groove 1013 Figure 9 As shown, a structure is formed that connects the dust blowing section and the welding avoidance section. Then, the dust blowing hole 10231 is connected to an external positive pressure device (not shown). The positive pressure airflow delivers air to the welding avoidance section to prevent dust from accumulating in the welding area. This can achieve efficient dust removal and precise protection of the welding area.

[0037] Optional, such as Figures 3 to 8 The main dust extraction unit shown includes: a first main dust extraction groove 1024, a main dust extraction hole 10241, and a second main dust extraction groove 1014; as shown Figure 6 As shown in Figures a and b, the first main dust extraction groove 1024 is connected to the lower side surface 1012 of the first substrate, and the main dust extraction hole 10241 communicates with the first main dust extraction groove 1024. Figure 3 Chinese figures a, b, Figure 4 and Figure 5 The second main dust extraction groove 1014 shown is installed on the upper side 1011 of the second substrate and is connected to the second welding clearance hole, the second dust blowing groove 1013 and the second auxiliary dust extraction groove 1015 respectively. like Figure 6 Figure a, Figure 7 and Figure 8 The first main dust extraction tank 1024 shown is connected to the outside through the main dust extraction hole 10241; like Figure 9 The second main dust extraction slot 1014 shown is adapted to the first main dust extraction slot 1024 and the main dust extraction hole 10241.

[0038] In this embodiment, the first main dust extraction groove 1024 is located on the other side of the first clearance hole 1022, and the second main dust extraction groove 1014 is located on the other side of the second clearance hole 1012. Thus, after the first substrate 102 and the second substrate 101 are fixed, a structure is formed in which the main dust extraction part is connected to the welding clearance part and the dust blowing part. Then, the negative pressure equipment or negative pressure pipe connected to the main dust extraction hole 10241 can use the negative pressure airflow to collect the dust blown by the dust blowing part, forming a positive and negative pressure closed-loop dust removal system to prevent dust from spreading outward.

[0039] Optional, such as Figures 3 to 8 The auxiliary dust extraction unit shown includes: a first auxiliary dust extraction tank 1025, an auxiliary dust extraction hole 10251, and a second auxiliary dust extraction tank 1015; as shown Figure 6 Figure a, Figure 7 and Figure 8 The first auxiliary dust extraction slot 1025 is connected to the lower side surface 1012 of the first substrate, and the auxiliary dust extraction hole 10251 communicates with the first auxiliary dust extraction slot 1025; as shown Figure 3 Chinese figures a, b, Figure 4 and Figure 5 The second auxiliary dust extraction groove 1015 shown is installed on the upper side 1011 of the second substrate and is connected to the second welding clearance hole, the second dust blowing groove 1013 and the second main dust extraction groove 1014 respectively. The first auxiliary dust extraction tank 1025 is connected to the outside through the auxiliary dust extraction hole 10251, such as Figure 9 and Figure 10 The second dust extraction slot 1015 shown is adapted to the first dust extraction slot 1025 and the secondary dust extraction hole 10251.

[0040] In this embodiment, the first auxiliary dust extraction groove 1025 is located in the middle of the first clearance hole 1022, and the second auxiliary dust extraction groove 1015 is located in the middle of the second clearance hole 1012. Thus, after the first substrate 102 and the second substrate 101 are fixed, as... Figure 9 and Figure 10 The structure shown connects the auxiliary dust extraction section with the main dust extraction section, the welding avoidance section, and the dust blowing section. The auxiliary dust extraction port 10251 is connected to an external negative pressure device or negative pressure pipeline, which can work in coordination with the main dust extraction section. It increases the negative pressure on the basis of the main dust extraction section, so that the dust is discharged from the welding area at high speed. At the same time, it increases the number of adsorption channels. The auxiliary dust extraction port 10251 sucks up the escaped dust.

[0041] Optional, such as Figure 4 and Figure 12 The second substrate 101 shown has rounded corners 1017 at both ends where it contacts the sides of the groove 201. In this embodiment, both the electrode tab and the connecting piece extend from the core 30 into the groove 201 and are fully unfolded within the groove 201; as shown Figure 12The design of the rounded corner 1017 shown can avoid bending and squeezing of the positive and negative tabs 50 and connecting pieces by the edge of the second substrate 101, further protecting the overall shape of the tabs.

[0042] Optional, such as Figure 3 and Figure 6 The first substrate 102 and the second substrate 101 shown are both provided with matching connection holes 1016, and the connection hole on the first substrate 102 is a countersunk hole 1026; in this embodiment, the connection hole 1016 is a threaded hole. After the first substrate 102 and the second substrate 101 are assembled, the bolt head is fully accommodated by the countersunk hole 1026 to prevent the bolt from protruding from the surface of the first substrate 102.

[0043] The first substrate 102 is also connected to an external drive device, which is used to drive the dust removal base 10 toward the core winding fixture 20 after the first substrate 102 and the second substrate 101 are assembled. In this embodiment, the dust removal base 10 is driven to reciprocate toward the core winding fixture 20 by a robotic arm or an external drive device, which replaces manual labor and reduces labor costs.

[0044] Optional, such as Figure 7 and Figure 8 The first substrate 102 shown includes: a middle plate and two pressure plates 1027; the middle plate is adapted to the groove 201 and the second substrate 101, and the two pressure plates 1027 are symmetrically mounted on both sides of the middle plate and adapted to the core receiving groove 202; as shown Figure 1 The two pressure plates 1027 shown are used to press down on the core 30 placed in the core receiving groove 202.

[0045] In this embodiment, the core 30 is pressed and fixed by two pressure plates 1027. The two pressure plates 1027 apply equal pressure to the core 30 on both sides with the middle plate as the center of symmetry. This can prevent the core 30 from shifting or the tension from being inconsistent. This achieves high-precision positioning, dynamic stability control and tab protection during the assembly and welding process of the core 30. At the same time, after the two pressure plates 1027 limit the core 30, they can suppress the friction between the core 30 and the core receiving groove 202, effectively blocking the transmission of external vibration.

[0046] Optionally, the dust blowing unit is connected to a positive pressure device via a compressed air pipeline, while the main dust extraction unit and the auxiliary dust extraction unit are connected to negative pressure devices via corresponding negative pressure dust extraction pipelines.

[0047] In this embodiment, the air compressor is connected to the external compressed air pipeline through the dust blowing hole 10231, and the main dust extraction hole 10241 and the auxiliary dust extraction hole 10251 are respectively connected to the corresponding negative pressure dust extraction pipelines to the dust collector or the central dust collection system. By combining the positive pressure blowing of compressed air and the multi-stage negative pressure suction, efficient dust removal, particulate pollution control and process environment stability improvement are achieved before and after the core 30 is welded. Example

[0048] This embodiment provides a welding assistance method based on the apparatus described in embodiment 1, comprising: Step 1: An external power drive device (such as a cylinder, not shown) places the incoming material core into the core receiving groove of the core fixture, and lays the positive electrode tab, negative electrode tab, positive electrode connecting piece and negative electrode connecting piece on the core flat in the groove, wherein the positive electrode connecting piece and negative electrode connecting piece are located below the positive electrode tab and the negative electrode tab, respectively. Step 2: After assembling and fixing the first substrate and the second substrate, a dust removal base is formed. The dust removal base is then fastened into the groove, and the welding clearance portion is aligned with the upper part of the left positive electrode tab. Step 3: The ultrasonic welding head extends into the welding clearance section to weld the left positive electrode tab. During the welding process, the relevant external positive and negative pressure devices are simultaneously turned on to supply high-pressure air to the dust blowing section and negative pressure airflow to the main dust extraction section and the auxiliary dust extraction section, respectively. The metal dust generated during welding is cleaned by positive pressure through the dust blowing section and collected by negative pressure through the main dust extraction section and the auxiliary dust extraction section. Finally, the metal dust generated during welding is efficiently discharged through the main dust extraction hole and the auxiliary dust extraction hole. Step 4: After the left positive electrode tab is welded, remove the dust removal base and ultrasonic welding head, turn the position of the dust removal base and re-fasten it in the groove, or turn the position of the core jig and re-fasten it with the auxiliary device so that the welding avoidance part is aligned with the left negative electrode tab. Repeat the above steps to complete the welding of all positive and negative electrode tabs in sequence.

[0049] Step 5: After completing the welding of the four electrodes, remove the ultrasonic welding head. An external power drive device (such as a cylinder, not shown) will detach the dust collection base from the groove. The core, along with the core fixture, is then transported by the logistics system to the next workstation.

[0050] In this embodiment, four ultrasonic welding operations are required to complete the welding of the core. The dust removal base can shape the tabs of the incoming core to prevent the tabs from being missed during welding due to folding. At the same time, the welding of the tabs is precisely positioned and isolated for dust removal, realizing an integrated design of tab shaping and welding dust removal.

[0051] In summary, this invention uses a dust-collecting base and a core-rolling fixture to separately set and position the core and tabs in different areas during the welding process. The dust-collecting base improves welding accuracy through welding avoidance parts, while the dust blowing part, main dust extraction part, and auxiliary dust extraction part efficiently remove metal residues generated during welding, preventing metal residues from spreading into the core and improving battery yield. The core-rolling fixture of this invention uses grooves to accommodate the positive tab, negative tab, positive connecting piece, and negative connecting piece, allowing them to be fully laid flat under the dust-collecting base. This avoids incomplete or missing welds on the tabs and prevents deformation and damage to the tabs due to airflow interference.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A welding auxiliary device, characterized in that, include: The dust removal base includes a first substrate and a second substrate disposed on the first substrate; The core fixture includes a groove adapted to the dust collection base and core receiving slots located on both sides of the groove; The first substrate and the second substrate are provided with a number of corresponding holes and slots. After the first substrate and the second substrate are fixed, the corresponding holes and slots form a welding avoidance part, a dust blowing part, a main dust extraction part and a secondary dust extraction part. The groove is used to accommodate the dust removal base, positive electrode tab, negative electrode tab, positive electrode connecting piece, and negative electrode connecting piece.

2. The welding auxiliary device according to claim 1, characterized in that, The welding clearance portion includes a first clearance hole formed on the first substrate and a second clearance hole formed on the second substrate; The first clearance hole and the second clearance hole are axially opposite each other after the first substrate and the second substrate are fixed, and the inner surface of the second clearance hole is a beveled surface.

3. The welding auxiliary device according to claim 1, characterized in that, The dust blowing section includes a first dust blowing groove formed on a first substrate, a dust blowing hole communicating with the first dust blowing groove, and a second dust blowing groove formed on a second substrate and communicating with a welding avoidance section, a main dust extraction section and a secondary dust extraction section respectively. The first dust blowing groove is located on the lower side of the first substrate and communicates with the outside through a dust blowing hole; The second dust-blowing groove is located on the upper side of the second substrate and is adapted to the first dust-blowing groove and dust-blowing hole.

4. The welding auxiliary device according to claim 1, characterized in that, The main dust extraction section includes a first main dust extraction groove connected to the first substrate, a main dust extraction hole communicating with the first main dust extraction groove, and a second main dust extraction groove installed on the second substrate and communicating with the welding avoidance section, the dust blowing section and the auxiliary dust extraction section respectively. The first main dust extraction tank is located on the lower side of the first substrate and communicates with the outside through the main dust extraction hole; The second main dust extraction groove is located on the upper side of the second substrate and is adapted to the first main dust extraction groove and the main dust extraction hole.

5. The welding auxiliary device according to claim 1, characterized in that, The auxiliary dust extraction unit includes a first auxiliary dust extraction groove connected to the first substrate, an auxiliary dust extraction hole communicating with the first auxiliary dust extraction groove, and a second auxiliary dust extraction groove installed on the second substrate and communicating with the welding avoidance part, the dust blowing part, and the main dust extraction unit respectively. The first auxiliary dust extraction tank is located on the lower side of the first substrate and communicates with the outside through the auxiliary dust extraction hole; The second auxiliary dust extraction groove is located on the upper side of the second substrate and is adapted to the first auxiliary dust extraction groove and auxiliary dust extraction hole.

6. The welding auxiliary device according to claim 1, characterized in that, The second substrate has rounded corners at both ends that contact the sides of the groove.

7. The welding auxiliary device according to claim 1, characterized in that, Both the first substrate and the second substrate have corresponding connection holes, and the connection hole on the first substrate is a countersunk hole; The first substrate is also connected to an external driving device for driving the dust removal base toward the core jig after the first substrate and the second substrate are assembled.

8. The welding auxiliary device according to claim 1, characterized in that, The first substrate includes a central plate adapted to the groove and the second substrate, and two pressure plates symmetrically mounted on both sides of the central plate and adapted to the core receiving groove. The two pressure plates are used to press down on the core placed in the core receiving slot.

9. The welding auxiliary device according to claim 1, characterized in that, The dust blowing section is connected to a positive pressure device via a compressed air pipeline, and the main dust extraction section and the auxiliary dust extraction section are connected to negative pressure devices via corresponding negative pressure dust extraction pipelines.

10. A welding-assisted method, characterized in that, The welding auxiliary device according to any one of claims 1-9 includes: Place the core in the core receiving groove of the core fixture, and lay the positive electrode tab, negative electrode tab, positive electrode connecting piece and negative electrode connecting piece on the core flat in the groove, wherein the positive electrode connecting piece and negative electrode connecting piece are located below the positive electrode tab and the negative electrode tab respectively. After the first substrate and the second substrate are assembled and fixed together, a dust removal base is formed. The dust removal base is then fastened into the groove, and the welding clearance portion is aligned with the top of one of the tabs. The ultrasonic welding head extends into the welding clearance section to weld the lower electrode tab. During the welding process, the positive pressure device and the negative pressure device are turned on to deliver high-pressure air to the dust blowing section and negative pressure airflow to the main dust extraction section and the auxiliary dust extraction section, respectively. The metal dust generated during welding is cleaned by positive pressure through the dust blowing section and collected by negative pressure through the main dust extraction section and the auxiliary dust extraction section. After the current electrode tab is welded, remove the dust removal base and ultrasonic welding head, turn the position of the dust removal base and re-fasten it in the groove, or turn the position of the core jig and re-fasten it with the auxiliary device, so that the welding avoidance part is aligned with the next electrode tab, and repeat the above steps to complete the welding of all positive and negative electrode tabs in sequence.

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